Day 12: Forgot to use the formatter
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@ -1,5 +1,5 @@
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import Data.List.Split
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import Data.List
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import Data.List
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import Data.List.Split
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import Linear.V3
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import Linear.V3
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main :: IO ()
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main :: IO ()
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@ -18,32 +18,41 @@ toV3 = map (\[x,y,z]->V3 x y z)
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parseContent :: String -> [[Int]]
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parseContent :: String -> [[Int]]
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parseContent = map (map read . splitOn ",") . lines . removeJunk
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parseContent = map (map read . splitOn ",") . lines . removeJunk
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where removeJunk xs = [ x | x <- xs, x `notElem` " <>xyz=" ]
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where
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removeJunk xs = [x | x <- xs, x `notElem` " <>xyz="]
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step :: (Num a, Eq a) => ([a], [a]) -> ([a], [a])
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step :: (Num a, Eq a) => ([a], [a]) -> ([a], [a])
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step (moons, vel) = (zipWith (+) moons newVel, newVel)
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step (moons, vel) = (zipWith (+) moons newVel, newVel)
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where dVel = gravity moons
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where
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dVel = gravity moons
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newVel = zipWith (+) vel dVel
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newVel = zipWith (+) vel dVel
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gravity xs = [sum [signum $ x - y | x <- xs, y /= x] | y <- xs]
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gravity xs = [sum [signum $ x - y | x <- xs, y /= x] | y <- xs]
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energy :: ([V3 Int], [V3 Int]) -> Int
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energy :: ([V3 Int], [V3 Int]) -> Int
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energy (x,y) = sum $ zipWith (*) (geten x) (geten y) where
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energy (x, y) = sum $ zipWith (*) (geten x) (geten y)
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where
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geten = map (sum . abs)
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geten = map (sum . abs)
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findPeriod :: (Num a, Eq a) => ([a], [a]) -> ([a], [a]) -> Int -> Int
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findPeriod :: (Num a, Eq a) => ([a], [a]) -> ([a], [a]) -> Int -> Int
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findPeriod x a n = if x'==a then n else findPeriod x' a (n+1)
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findPeriod x a n =
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where x' = step x
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if x' == a
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then n
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else findPeriod x' a (n + 1)
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where
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x' = step x
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part2 :: (Num a, Eq a) => ([[a]], [[a]]) -> Int
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part2 :: (Num a, Eq a) => ([[a]], [[a]]) -> Int
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part2 (moons, vel) = lcm' periods
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part2 (moons, vel) = lcm' periods
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where m = transpose moons
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where
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m = transpose moons
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v = transpose vel
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v = transpose vel
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periods = zipWith (curry findPeriod') m v
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periods = zipWith (curry findPeriod') m v
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findPeriod' x = findPeriod x x 1
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findPeriod' x = findPeriod x x 1
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lcm' :: [Int] -> Int
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lcm' :: [Int] -> Int
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lcm' xs = product $ zipWith (^) nums maxElems
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lcm' xs = product $ zipWith (^) nums maxElems
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where nums = nub $ concat decomp
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where
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nums = nub $ concat decomp
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decomp = map decomposition xs
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decomp = map decomposition xs
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maxElems = [maximum $ map (length . elemIndices x) decomp | x <- nums]
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maxElems = [maximum $ map (length . elemIndices x) decomp | x <- nums]
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